CN109147749B - High-sound-absorption-rate communicated multi-cavity resonant sound absorption covering layer - Google Patents
High-sound-absorption-rate communicated multi-cavity resonant sound absorption covering layer Download PDFInfo
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- CN109147749B CN109147749B CN201810621470.8A CN201810621470A CN109147749B CN 109147749 B CN109147749 B CN 109147749B CN 201810621470 A CN201810621470 A CN 201810621470A CN 109147749 B CN109147749 B CN 109147749B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/127—Underwater acoustics, e.g. for submarine
Abstract
The invention discloses a communicating multi-cavity resonance type sound absorption covering layer with high sound absorption rate, which is characterized by comprising the following components: the matching layer and the elastic damping layer containing the air cavity are connected with the matching layer; a plurality of communicated multi-cavities are arranged in the elastic damping layer containing the air cavity; the communicating multi-cavity is formed by rotating a left arc line and a right arc line around a central shaft of the communicating multi-cavity, and the central shaft of the communicating multi-cavity is parallel to the thickness direction of the elastic damping layer containing the air cavity; the left/right arc line is a sine-like curve, and each peak point of the curve is in gradient change. The invention greatly improves the acoustic performance of the traditional cavity resonance type sound absorption covering layer, and the connected multi-cavity structure enables the impedance of the surface of the high-sound-absorption-rate connected multi-cavity resonance type sound absorption covering layer and water to be perfectly matched, thereby absorbing the sound wave energy incident on the interface of the water-acoustic covering layer to the maximum extent and minimizing the reflection.
Description
Technical Field
The invention relates to a communicating multi-cavity resonance type sound absorption covering layer with high sound absorption rate, which is laid on the surface of an underwater vehicle and belongs to the field of sound absorption and noise reduction design.
Background
The sound absorption and noise reduction problems of the underwater vehicle are highly emphasized in various countries, and the existing acoustic covering layer technology is the only comprehensive technology which can reduce the target intensity of the underwater vehicle and inhibit the radiation noise of the underwater vehicle. The first submarine shell of the German navy in the second war of research was provided with a layer of synthetic rubber sound-proof material named "Alberich (Alberic)", the earliest resonant acoustic coating containing a short cylindrical cavity.
Through the development of half a century, the shape of the cavity of the resonant sound absorption covering layer appears to be over spherical, conical, truncated cone, exponential and the like. For example, a binary embedded cylindrical cavity sound absorption covering layer, the cylindrical cavities are distributed in a periodic distribution array. At present, the known underwater resonance type sound absorption coating is most widely used as a sound absorption coating containing an exponential cavity. In the patent and literature research of the existing cavity resonance type Acoustic covering layer, most of the work is still designed for the existing cavity (cylindrical, exponential) Acoustic covering layer, for example, the literature "Acoustic horn optimization using the finite element and genetic algorithm" optimizes the circular truncated cone cavity geometry of the Acoustic covering layer, and the Acoustic covering layer technology is greatly influenced by the cavity structure.
With the continuous development of underwater sonar technology, higher requirements are provided for the stealth performance of the underwater vehicle, and the existing cavity structure cannot well meet the requirements of high sound absorption rate under different frequency bands, so that the design of a cavity resonance type acoustic covering layer with high sound absorption rate has great significance in providing a cavity structure with better sound absorption performance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a communicating multi-cavity resonance type sound absorption covering layer with high sound absorption rate. The resonant sound absorption covering layer with high sound absorption rate is obtained by designing communicated multiple cavities on the elastic damping layer, the sound wave energy incident to the interface of the water-acoustic covering layer is absorbed to the maximum extent, and the sound wave entering the elastic damping layer is consumed in a mode of multi-cavity resonance and wave mode conversion. The technical means adopted by the invention are as follows:
a communicating type multi-cavity resonance type sound absorption covering layer with high sound absorption rate comprises: the matching layer and the elastic damping layer containing the air cavity are connected with the matching layer;
a plurality of communicated multi-cavities are arranged in the elastic damping layer containing the air cavity;
the communicating multi-cavity is formed by rotating a left arc line and a right arc line around a central shaft of the communicating multi-cavity, and the central shaft of the communicating multi-cavity is parallel to the thickness direction of the elastic damping layer containing the air cavity;
the left/right arc line is a sine-like curve, and each peak point of the curve is in gradient change.
The communicated multiple cavities are arranged periodically in an array.
The number of the communicated multiple cavities can be adjusted according to the thickness of the elastic damping layer containing the air cavity.
The distance between each wave trough and wave crest of the left/right arc line and the central axis of the communicated multi-cavity corresponding to the wave troughs and wave crests can be adjusted according to the porosity of the elastic damping layer containing the air cavity.
The matching layer and the elastic damping layer containing the air cavity are made of viscoelastic materials or super-elastic materials.
The thickness of the matching layer is smaller than that of the elastic damping layer containing the air cavity, the upper surface of the matching layer is in direct contact with water, the lower surface of the matching layer is bonded with the upper surface of the elastic damping layer containing the air cavity, the lower surface of the elastic damping layer containing the air cavity is provided with a connecting part which is attached to the surface of a shell of an underwater moving body, namely, the central axes of the communicated multiple cavities are perpendicular to the matching layer.
And each peak point of the left/right arc line is in increasing gradient change from the upper surface of the air-containing cavity elastic damping layer to the lower surface of the air-containing cavity elastic damping layer.
The upper ends of the communicated multiple cavities are in point contact with the upper surface of the elastic damping layer containing the air cavity.
The high sound absorption performance of the communicated multi-cavity resonance type sound absorption covering layer which ensures that the high sound absorption rate can work under a specific sound wave frequency band is realized as follows: the connected multi-cavity design not only enables the elastic damping layer containing the air cavities to show high damping characteristics (shear loss) under the condition that sound waves are vertically incident, but also consumes more sound wave energy through cavity resonance, so that the connected multi-cavity resonance type sound absorption covering layer with high sound absorption rate shows high sound absorption rate performance.
Due to the adoption of the technical scheme, the invention has the following advantages:
the invention greatly improves the acoustic performance of the traditional cavity resonance type sound absorption covering layer, and the connected multi-cavity structure ensures that the impedance of the surface of the high-sound-absorption-rate connected multi-cavity resonance type sound absorption covering layer and water is perfectly matched, thereby absorbing the sound wave energy incident on the interface of the water-acoustic covering layer to the maximum extent and minimizing the primary reflection;
the communicated multi-cavity structure enables the sound waves entering the high-sound-absorption-rate communicated multi-cavity resonant sound absorption covering layer to generate multiple resonance and carry out multiple scattering on the sound waves, so that the sound energy of the sound waves is almost completely lost, and the secondary or multiple reflection is zero;
the communicated multi-cavity structure is provided for the design of the traditional cavity resonance type sound absorption covering layer, the sound absorption effect under the specific frequency band is obviously superior to that of the existing cavity resonance type sound absorption covering layer, and the sound absorption covering layer has good and wide application prospect.
Based on the reason, the invention can be widely popularized in the fields of sound absorption and noise reduction design and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover layer according to an embodiment of the present invention.
Fig. 2 is an enlarged schematic view of part I of fig. 1.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is a graph comparing the sound absorption coefficient of the high-sound-absorption-rate connected multi-cavity resonance type sound absorption covering layer and the resonance type sound absorption covering layer with the exponential-shaped cavity with frequency variation in a specific frequency band according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, a communicating type multi-cavity resonance type sound-absorbing cover layer with high sound-absorbing rate, comprising: the matching layer 1 and the elastic damping layer 2 containing an air cavity connected with the matching layer;
a plurality of communicated multi-cavity 3 are arranged in the air-containing cavity elastic damping layer 2;
the communicating multi-cavity 3 is formed by rotating a left/right arc line 4 around the central axis of the communicating multi-cavity 3, and the central axis of the communicating multi-cavity 3 is parallel to the thickness direction of the elastic damping layer 2 containing the air cavity;
the left/right arc 4 is a sine-like curve, and each peak point of the curve is in gradient change.
The communicating multi-cavity 3 is arranged periodically in an array.
The number of the communicated multi-cavity 3 can be adjusted according to the thickness of the elastic damping layer 2 containing the air cavity.
The distance between each wave trough and wave crest of the left/right arc line 4 and the central axis of the corresponding communicating multi-cavity 3 can be adjusted according to the porosity of the elastic damping layer 2 containing the air cavity.
The matching layer 1 and the elastic damping layer 2 containing the air cavity are made of viscoelastic materials or super-elastic materials.
The thickness of matching layer 1 is less than contain air chamber elastic damping layer 2's thickness, the lower surface of matching layer 1 with contain the upper surface bonding of air chamber elastic damping layer 2, the lower surface that contains air chamber elastic damping layer 2 has the connecting portion of laminating mutually with the casing surface of the sports body under water.
Each peak point of the left/right arc line 4 is gradually changed from the upper surface of the air-containing cavity elastic damping layer 2 to the lower surface of the air-containing cavity elastic damping layer 2.
The upper end of the communicating multi-cavity 3 is in point contact with the upper surface of the elastic damping layer 2 containing the air cavity.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A communicating multi-cavity resonance type sound-absorbing cover layer with high sound-absorbing rate, comprising: the matching layer and the elastic damping layer containing the air cavity are connected with the matching layer;
a plurality of communicated multi-cavities are arranged in the elastic damping layer containing the air cavity;
the communicating multi-cavity is formed by rotating a left arc line and a right arc line around a central shaft of the communicating multi-cavity, and the central shaft of the communicating multi-cavity is parallel to the thickness direction of the elastic damping layer containing the air cavity;
the left/right arc line is a sine-like curve, and each peak point of the left/right arc line is gradually changed from the upper surface of the elastic damping layer containing the air cavity to the lower surface of the elastic damping layer containing the air cavity.
2. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the communicated multiple cavities are arranged periodically in an array.
3. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the number of the communicated multiple cavities can be adjusted according to the thickness of the elastic damping layer containing the air cavity.
4. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the distance between each wave trough and wave crest of the left/right arc line and the central axis of the communicated multi-cavity corresponding to the wave troughs and wave crests can be adjusted according to the porosity of the elastic damping layer containing the air cavity.
5. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the matching layer and the elastic damping layer containing the air cavity are made of viscoelastic materials or super-elastic materials.
6. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the thickness of matching layer is less than contain air chamber elastic damping layer's thickness, the lower surface of matching layer with contain air chamber elastic damping layer's upper surface bonding, contain air chamber elastic damping layer's lower surface has the connecting portion of laminating mutually with the casing surface of the sports body under water.
7. The communicating high-sound-absorption-rate multi-cavity resonance type sound-absorbing cover according to claim 1, wherein: the upper ends of the communicated multiple cavities are in point contact with the upper surface of the elastic damping layer containing the air cavity.
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| CN110444188B (en) * | 2019-07-30 | 2021-08-03 | 华中科技大学 | Underwater perforated mixed cavity structure acoustic covering layer |
| CN111890741B (en) * | 2020-07-29 | 2022-05-13 | 中国人民解放军军事科学院国防科技创新研究院 | Underwater sound absorption metamaterial based on novel hole cavity |
| CN113593513B (en) * | 2021-07-20 | 2024-04-19 | 江苏科技大学 | Target sound scattering stealth covering layer based on symmetrical medium surface and implementation method thereof |
| CN114104234B (en) * | 2021-11-30 | 2023-08-08 | 浙江大学 | Cover layer diffuse reflection type sound absorption super-structure unit and super-structure |
| CN114802043B (en) * | 2022-06-27 | 2022-09-23 | 质子汽车科技有限公司 | Vehicle cab and vehicle |
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| CN102693719A (en) * | 2012-06-01 | 2012-09-26 | 西安交通大学 | Half-perforated foam sound absorbing structure with variable connectivity rate |
| CN102820029B (en) * | 2012-08-24 | 2014-06-18 | 广州市泰力高复合材料有限公司 | Muffling structure |
| CN103016030B (en) * | 2012-12-21 | 2014-08-20 | 南通大学 | Broadband sound absorbing material and sound absorbing device |
| KR101422113B1 (en) * | 2013-04-26 | 2014-07-22 | 목포해양대학교 산학협력단 | Soundproof wall which has overlapped resonant chambers around air or water passage that makes air or water pass freely |
| JP6543113B2 (en) * | 2014-07-01 | 2019-07-10 | 株式会社日本コンポジット工業 | Sound absorbing structure |
| CN104616647A (en) * | 2014-12-26 | 2015-05-13 | 北京市劳动保护科学研究所 | Composite sound absorption structure |
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